1. Nah, not really
2. No but I think it's better as a middle name.
3.
Charlotte Anais,
Olivia Anais,
Violet Anais,
Claire Anais,
Isabel Anais4. No
5. Without the accent mark it's slightly pretentious. With the accent mark it's very pretentious.
Just an FYI that it looks and sounds a lot like "anus".